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Income Taxes - Summary of Components of Income Tax Expense (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2020 INR (₨)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 INR (₨)	Mar. 31, 2018 INR (₨)
Current taxes
Domestic	₨ 18,437		₨ 17,987	₨ 18,500
Foreign	5,887		5,663	7,834
Current taxes	24,324		23,650	26,334
Deferred taxes
Domestic	1,624		(180)	3
Foreign	(1,149)		1,772	(3,947)
Deferred taxes	475		1,592	(3,944)
Income tax expense	₨ 24,799	$ 329	₨ 25,242	₨ 22,390

X

- Definition

The amount of current tax expense (income) and adjustments for the current tax of prior periods. [Refer: Current tax expense (income); Adjustments for current tax of prior periods]

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The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities]

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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